7.0 drilling slim wells
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DEA 2006(e) 7 8 Sept D Dupuis
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Drilling Slim Wells
3rd Quarter 2006 DEA(e) Sept 7&8th
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Agenda
Historic
Aim
Problematic (Challenges)
Development-Achievement 1990-1997
Experience
Conclusions
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Historic
1950s Early experience
Mining technology Transposition from mineral formations to sedimentary
formation
Value of core
Difficulties
Retrofit system
Adaptation of conventional Technology
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Historic 1950s
Rising development costs are recognized as one ofthe major problems facing the oil industry today. Tocombat this situation, several new concepts designed to improvedrilling techniques have been advanced within recent years. Among
the ideas proving most effective is slim hole drilling. Carter's slim hole experience has been in both exploration and pool
development wells. In addition, slim hole practices have beensuccessfully applied to water injection wells. In comparison withstandard operations, both penetration rate and bit life decreased
using slim hole methods. No difficulty was encountered in coring,logging and testing in reduced diameter holes. Actual slim holecosts indicated a significant economic advantage over conventionalpractices. Savings in dry hole costs ranged up to 25 per cent,primarily from reductions in footage and day work rates. Additionalsavings accrued in producing wells from economy in tubulargoods. Slim hole methods may not always be applicable, asconsideration should be given to specific drilling problems andobjectives. In many cases, however, slim hole drilling providessignificant economic advantages over conventional practices.
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Historic Mining Technology
Coring system deriving from mining industry use ofrods
Focussing on geological evaluation and based uponcontinuous coring of the formation
Development of site core evaluation logging process
Difficulties Kick control and mud window
Leaders AMOCO BP
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Historic Retrofit System
Based on destructive drilling scale down of hole size
Use of conventional rig
Drilling methodology: use of small PDM and
Thrusters (sliding mode)
Wire line log to evaluate formations
Few records, cost of BHA
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Historic
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Historic (Elf Forasol)
Taking advantage of above experience development
of a specific system taking of above experience and
fitted for purpose equipment
Destructive drilling as well as continuous coring
Integration of services;
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Aim
Reduce cost
Obtain data and production
Reduce environmental impact
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Problematic and challenges
Minimum Final hole diameters, intermediate phases
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Problematic and challenges
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Problematic and challenges
Drilling
Ad-equation hole diameter tubular dimension
Pulling torque
Hydraulic ECD (monitoring/ mud window) Monitoring of dril ling parameters
WOB especially
Kick detection
Kick control
Data acquisition
Coring, logging, testing
Environment Waste treatment on site, surface lay out reduced as much as
possible
Production
Reduced crew, Service integration
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Achievement Drilling
Tubular
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Achievement Drilling ECD
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Achievement Drilling ECD mud window
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Achievement Drilling Parameters
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Achievement Drilling Kick detection
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Achievement Drilling Kick control
Procedure
Same as conventional (drillers method ..)Upon alert (pit level, KDS.. Close immediately
well
Major kick was controlled as procedure withno problem
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Achievement Data Acquisition
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Achievement Data Acquisition Continuous coring
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Achievement Data Acquisition
Wire line logging
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Achievement Data Acquisition
Testing
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Achievement Environment Lay out
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Achievement Environment Lay out
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Achievement Environment Lay out
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Achievement Environment Waste treatment
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Achievement Production
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Achievement Production
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Achievement Production
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Achievement services integration
Destructive drill ing and continuous coring
Integrated monitoring of dril ling parameters
Integrated waste control
Integrated cementing operation
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Experience
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Experience ELF (TOTAL)Last dri ll ing phase 3 3/8
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Experience ELF (TOTAL)
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Experience ELF (TOTAL)
Last dri ll ing phase 4
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Experience ELF (TOTAL)
Last dri ll ing phase 4
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Experience ELF (TOTAL)
Last dri ll ing phase 4
3 geological side tracks
R S
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Experience Rumania Shell
Last dri lling phase 4
TVD 3000m
E i R i Sh ll
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Experience Rumania Shell
Last dri lling phase 4
TVD 3000m
E i R i Sh ll
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Experience Rumania Shell
Geological evaluation in 4 drilling phase
Wire line coring 2 size Good as a full size core
Wireline logging
Complete range of exploration tool run successfully
Log quality exceptionally good
Difficult ies to make interpretation RFT (repeatabil ity)
One fishing job with the Side Wall Sample Gun (Side wall Gun)
Cuttings analysis
Size and quantity sufficient, low gas reading
Well testing
Conducted in 4 liner without any problem
A l i C l i
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Analysis Conclusion
Drilling
ROP similar to conventional, even in some
occasion better
ECD, ad-equation string OD- hole diameter: key
element, narrow mud window prospect eliminateslim hole drill ing
Environment benefit is more than obvious
A l i C l i
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Analysis Conclusion
Geological evaluation
Satisfactory (except for RFT and side core)
Production
Up to 500 m3 slimhole wells can be used as
producer, versus a standard well the productionis reduced of 10%
Economy
Up to 50 % see next d ia
A l i C l i
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Analysis Conclusion
47 %
62 %
48 %
18 %
53 %
Conclusion
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Conclusion
What went wrong ???
Technical success
Viable economically
No commercial development !!!Or back in 50s
Slim hole methods may not always be applicable, asconsideration should be given to specific dril lingproblems and objectives. In many cases, however,slim hole drill ing provides signif icant economic
advantages over conventional practices
Thanks Questions
References
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References
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